In 1997, Adam Back invented „hashcash“, a solution to combat the increasing amount of spam mails. This turned out to be one of the essential building blocks (pun intended) of Bitcoin submitted by /u/TillAntonio
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Source and link to Reddit topic: In 1997, Adam Back invented „hashcash“, a solution to combat the increasing amount of spam mails. This turned out to be one of the essential building blocks (pun intended) of Bitcoin

Author: Reddit.com